Dr. John R. Schafer, over at Psychology Today, is back with another tip for detecting and countering liars. (Last week he shared what Well... tends to reveal.) This time around, we're off to the Land of Is:

If you think someone's lying, you can't really subject them to a polygraph test. But, it…
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Yes or No questions deserve "Yes" or "No" answers. When people choose not to answer "Yes" or "No," they go to the Land of Is. The Land of Is occupies the space between truth and deception. This murky area contains a labyrinth of half-truths, excuses, and suppositions.

The way one enters that "murky area" is by answering a "yes" or "no" question with a roundabout answer that's meant to misdirect. Here's an example:

You: Adam, does this hard drive full of circus clown pornography belong to you?

Me: Why would I save all that circus clown pornography on a hard drive when I can just get it online?

The idea of the misdirection is to create doubt in the person asking the question. The idea is to get the asker to assume they were silly for asking in the first place, because obviously it was a poor assumption to make. In these situations, however, the doubt the asker should have is whether or not the responder is being truthful. Schafer suggests redirecting the misdirection to get things back on track. In our example, you might say something like this:

You: I don't know why you would or would not save all those unsettling photos and videos of circus clowns in unusually compromising yet strangely erotic positions. That's not what I asked. I asked if the hard drive containing the pornography belongs to you.

Me: Yes it does.

You: Can I, uh...borrow it?

Me: Sure.

In the end, it works out for everyone. But seriously, there are two big takeaways here. First, if you want to detect a liar you should ask them a yes or no question. Second, if the person answering the question doesn't respond with a yes or no answer and instead tries to misdirect, remind them of what you asked. Whether they choose to lie or not, you'll probably know either way.